PAGE 36 AR7030 OPERATING MANUAL
Second order intermodulation effects : Measured as above with two signals of 0dBm at around 12.7MHz,
resolving the SUM frequency at 25.5MHz.
Intermodulation-free dynamic range : 104dB 2nd order intercept point : +85dBm
13. Spurious responses
Unwanted signal rejection : Quoted figures are the levels of unwanted signal, relative to wanted, required to
produce a similar S+N/N ratio. Many figures vary depending on the frequency the
receiver is tuned to, so ranges of values are given.
Spurious response Frequency Rejection
1st I F 45MHz 85 to > 100dB
2nd I F 455kHz > 100dB
1st I F image Fr + 90MHz 85 to > 100dB
2nd I F image Fr + 910kHz > 95dB
Others Fr ± >10kHz > 85dB
14. AGC characteristics
Dynamic characteristics quoted for a 30dB change in input level between -90dBm and -60dBm.
Output range (AM mode) : 19dB
Attack time (to within 2dB of final level) : 4ms (SSB modes) 8ms (AM and Sync modes)
Holdoff time (for first 2dB change) : 250ms (fast) 450ms (med) 1.0s (slow)
Decay time (to within 2dB of final level) : 700ms (fast) 1.15s (med) 2.0s (slow)
15. Audio quality
In-band intermodulation : For 2 signals more than 200Hz apart, all intermodulation products < -37dB.
Harmonic distortion : SSB modes, input signal at S9, THD < 0.2%.
AM modes, input signal at S9, THD < 1.3%.
Noise : AM mode ultimate S/N ratio 52dB (unweighted).
16. Frequency stability
The receiver uses a single frequency reference which is a temperature compensated crystal oscillator. TCXO
specification is ±2.5 ppm from -30°C to +75°C, and will typically give a receiver stability better than ±1ppm from
10°C to 40°C.
Specification subject to change due to continuous development of the receiver. E&OE.
© AOR Manufacturing Ltd 1995, 1996.
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